CN105490753B - Dynamic code reconstructs light coding/decoding system - Google Patents
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- CN105490753B CN105490753B CN201510848082.XA CN201510848082A CN105490753B CN 105490753 B CN105490753 B CN 105490753B CN 201510848082 A CN201510848082 A CN 201510848082A CN 105490753 B CN105490753 B CN 105490753B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
Abstract
The present invention provides a kind of dynamic codes to reconstruct light coding/decoding system, including the burst pulse optical sender, dynamic code reconstruct optical encoder, dynamic code reconstruct optical decoder, burst pulse photoreceiver being sequentially connected, it further includes control system that the dynamic code, which reconstructs light coding/decoding system, and the control system reconstructs optical encoder with the dynamic code respectively and dynamic code reconstruct optical decoder is connected.The beneficial effects of the present invention are: the present invention is by manipulating dynamic restructuring optical encoder and dynamic restructuring optical decoder based on the control system of system security strategy, achieve the variation and reconstruct of code word, and accurate coding and matching and decoding, it is ravesdropping to solve the problems, such as that existing optical network system is existing in terms of safety of physical layer, makes optical signal safe transmission.Present invention can apply to optical core networks, the access various optical fiber transmission networks such as net and enterprise network, meet the needs of optical-fiber network safety of physical layer, have broad application prospects.
Description
Technical field
The present invention relates to fields of communication technology more particularly to dynamic code to reconstruct light coding/decoding system.
Background technique
The safety of one, optical network system is seriously threatened:
Existing fiber communication system and network system are using optical fiber transmission information, and the open waveguide inherent characteristic of optical fiber determines
It is easy to obtain the communication information transmitted on optical fiber using the method for coupling, thus the information of optical fiber telecommunications system transmission is held
It is easily ravesdropping and is inevitable.A large amount of widely used conventional fiber optic communication systems work in OOK system now, and listener-in can
To capture the optical signal transmitted on optical fiber using energy-probe easily, and achieve the purpose that eavesdropping.
Prism door event has exposed has 200 a plurality of optical cables to be ravesdropping, facts proved that existing fiber communication system
It is unsafe with network.
Existing optical network system is substantially in the air in terms of safety of physical layer, without any safeguard measure, without resisting
The ability of Network Intrusion and anti-intercepting and capturing cannot ensure the safe transmission of information.With the development of social economy and Defence business, institute
The information security needed increasingly requires height, is especially badly in need of solving the safety problem of networked physics layer, it is necessary to establish ability of anti-interception
By force, the good optical-fiber network of safety establishes the new optical system and optical-fiber network architecture with security mechanism in photosphere.
Two, solve the problems, such as optical-fiber network safety of physical layer using optical code division multiple access technique:
Solve the problems, such as that the main technical schemes of safety of physical layer have at present: optical quantum communication, optical chaotic communication, light code divide more
Location (Optical Code Division Multiple Access, OCDMA) communication etc..Quantum Optical Communication, chaotic optical communication,
And OCDMA communication is rapidly developed, and is all carrying out research and extension in the U.S., Europe, Japan and China.It is some
Small-scale quantum communications try net is completed, but due to being limited by physical mechanism, current quantum-key distribution is suitable only for
It is transmitted in low rate, short-range signal, cannot achieve the encryption key distribution of high speed, the one time cryptosystem sheet of long range.About
Many researchs of optical chaos secret communication have been achieved for the research achievement of part, but these research achievements are in theory mostly
It is obtained under level or the ideal experiment condition of environment.Under actual environment, the parameter differences of both sides' chaos system, still
Need to solve parameter mismatch, noise jamming, the problems such as chaos system information leakage safety.OCDMA communication has been achieved with multiple
Place experiment, data rate is up to 10Gbit/s-40Gbit/s, and for transmission range up to 150km, technology is more mature, practical journey
Degree is higher, is the current effective prioritization scheme for solving optical fiber telecommunications system physical layer transmission safety problem.
Optical code division multiple access (Optical Code Division Multiple Access, OCDMA) technology is held with system
Outstanding advantages of amount is big, good confidentiality, strong antijamming capability, in OCDMA system, all users occupy same channel jointly
Similar frequency bands and period, it is that different coded sequences is leaned on to distinguish that different user, which transmits signal used in information, i.e., each use
A different pseudo-random sequence (user code) is all distributed at family.In transmitting terminal, according to corresponding address code, each of user
Information bit is encoded into a string signal.In receiving end, it is decoded according to the related operation of code word.Only when transmitting terminal and reception
When end address code is mutually matched, receiving terminal can be just correctly decoded, to correctly restore the input bit information of the user.Conversely,
When transmitting terminal and receiving end address code mismatch, the decoder output of receiving terminal is a random Gaussian, thus cannot
Restore the input bit information of the user.Thus optical cdma system is coded and decoded in area of light, its safety can be improved
Property, play the protective action of photosphere physical layer.
Network security problem is solved using optical code division multiple access technique, there are three types of different depth:
1. couple conventional surreptitiously person for intercepting and capturing means
Stealer does not have matching and decoding device, cannot intercept user information during optical transmission of information, using fixed light
Codec technology can carry out effective protection to photosphere, and the safety of system and the safety of code word are related.The pattern of code word,
Length, code weight, cardinality all have an impact to OCDMA safety.For the bipolar code that the OCDMA system that is concerned with uses, except mentioning
Outside high code length, primary study pattern and cardinality are needed, safety is further increased.From the angle of pattern, each use should be made
The address code at family is similar as far as possible, and is all pseudorandom light pulse signal in time domain and frequency domain.From the angle of cardinality,
Under conditions of identical code length, under the auto-correlation and cross-correlation restrictive condition of system requirements, cardinality is further increased.For
The unipolar code that incoherent OCDMA system uses, pattern, length, code weight, cardinality all have an impact to the safety of system.
It is, in general, that selected code word, performance is good, code length is long, cardinality is big, increases analysis difficulty, is considered safety
Property is good.
But this method has limitation, and with the progress of computing technique, the speed of analysis is accelerated, especially to existing direct
The optical fiber telecommunications system of the on-off keying (OOK, On-Off Keying) of detection can not solve only by increasing code length, code capacity
The certainly safety issue of optical cdma system.Because under OOK system, no matter which kind of code, as long as can be obtained with energy-probe
User information.
2. couple listener-in with special detection means
When listener-in possesses energy-probe or spectrum detector, the fixation light encoding and decoding to OOK system may be implemented
The eavesdropping of system.To in this case, for the safety for ensuring system, using the security policies of code conversion, such as " 11
The adjustable controllable code conversion method of static state studied during five " has using control system control photoswitch to a certain number of
The optical encoder of different code words switches over, and realizes code word transformation, plays the purpose of anti-intercepting and capturing.Although we add from safety
Gu strategy, is respectively provided with 4 ranks to code word order change, conversion time interval, highest level is that code word order change is set
It is set to " random " transformation, and time interval transformation is set as " random " transformation, makes listener-in that cannot capture user information forever,
It can protect photosphere safety.
But there is also limitation under " special circumstances ", this " special circumstances " refer to if matching and decoding device this method
The extreme case of " stolen " or " loss " can not ensure the safety of system at this time.
3. the extreme case of pair matching and decoding device " stolen " or " loss "
For this extreme case, it is necessary to using the optical encoder for not being afraid of " loss ", even if listener-in steals light volume
Decoder, can not acquisition of information.
Summary of the invention
The present invention provides a kind of dynamic code reconstruct light coding/decoding system, including be sequentially connected burst pulse optical sender,
Dynamic code reconstructs optical encoder, dynamic code reconstructs optical decoder, burst pulse photoreceiver, which reconstructs light coding/decoding system
It further include control system, optical encoder is reconstructed with the dynamic code respectively for the control system and the dynamic code reconstructs photodissociation code
Device is connected；
The burst pulse optical sender, which generates the burst pulse light sequence for carrying user information and generates 1 bit time delay N, to be divided
One of pulsewidth chip light pulse, N be selected code code length；
The dynamic code reconstruct optical encoder carries out pumped FIR laser transformation to the burst pulse light sequence for carrying user information, is controlling
Under system manipulation processed, the code word of coding can change, and dynamic code reconstruct optical encoder can be realized under control of the control system
The dynamic restructuring of its code word；
The dynamic code reconstruct optical decoder carries out matching and decoding under control system manipulation, to pumped FIR laser transformation signal,
The burst pulse light sequence of carrying user information before recovering pumped FIR laser；
The decoded burst pulse light sequence for carrying user information of light is carried out photoelectric conversion by the burst pulse photoreceiver,
Become narrow pulse electrical signals, and this rz signal is become into non-return-to-zero signal, then carry out electro-optic conversion, restores former optical signal.
As a further improvement of the present invention, the set-up of control system security strategy, provides the code of corresponding change rule
Word, and provide the control for realizing this code word respectively to dynamic code reconstruct optical encoder and dynamic code reconstruct optical decoder
Instruction.
As a further improvement of the present invention, the burst pulse optical sender include burst pulse light source module, optical modulator,
Optical signal prosessing module and amplification driver, the burst pulse light source module are connected with the optical modulator, the amplification driving
Device input terminal is connected with the optical signal prosessing module, and the amplification driver output end is connected with the optical modulator.
As a further improvement of the present invention, the burst pulse light source module includes gain-switching semiconductor laser, surpasses
Fast optical fiber laser, super even spectrum laser.
As a further improvement of the present invention, the variation of the code word of dynamic code reconstruct optical decoder and dynamic restructuring with
The dynamic code reconstruct optical encoder is synchronous, the dynamic code reconstruct optical decoder and dynamic code reconstruct optical encoder
Code word match, and remain and match during synchronous variation and dynamic restructuring.
As a further improvement of the present invention, dynamic code reconstruct optical encoder include one-dimensional time domain, frequency domain coding,
And two-dimentional time-frequency domain coding, the dynamic code reconstruct optical decoder include one-dimensional time domain, the decoding of frequency domain and two-dimentional time-frequency
Domain decoding,.
As a further improvement of the present invention, the code of the dynamic code reconstruct optical encoder and dynamic code reconstruct optical decoder
Word includes the m-sequence and Gold sequence, the light orthogonal code of unipolar code, prime codes, algebra congruence codes of bipolar code.
As a further improvement of the present invention, the dynamic code reconstruct optical decoder includes the photodetection being sequentially connected
Device, narrow pulse clock data recovery module and electronic signal processing module.
As a further improvement of the present invention, the dynamic code reconstruct optical encoder and the dynamic code reconstruct optical decoder
Dynamic structure include super-structure optical fiber grating, optical fiber optical grating array, optical delay line, adjustable optical delay line, waveguide optical grating array,
Wavelength-selective switches.
As a further improvement of the present invention, the set-up of control system security of system rank configures code word and its moves
State changes program, and provides the computer program of the relationship between code word and the physical parameter of dynamic restructuring optical coder/decoder,
As control instruction, the physical parameter of dynamic restructuring optical coder/decoder is controlled, it is made to show existing code realistic as needed
Word, and show and manipulate on computer visualization interface in real time.
The beneficial effects of the present invention are: the present invention is by manipulating dynamic weight based on the control system of system security strategy
Structure optical encoder and dynamic restructuring optical decoder achieve the variation and reconstruct of code word, and accurate coding and matching solution
Code is ravesdropping to solve the problems, such as that existing optical network system is existing in terms of safety of physical layer, passes optical signal safely
It is defeated.Present invention can apply to optical core networks and the access various optical fiber transmission networks such as net and enterprise network, meet optical-fiber network physics
The demand of layer safety, has broad application prospects.
Detailed description of the invention
Fig. 1 is the composition schematic diagram of dynamic code reconstruct light coding/decoding system of the present invention.
Fig. 2 is burst pulse optical sender composition schematic diagram of the invention.
Fig. 3 is burst pulse photoreceiver schematic diagram of the invention.
Fig. 4 is control system login page figure of the invention.
Specific embodiment
As shown in Figure 1, the invention discloses a kind of dynamic codes to reconstruct light coding/decoding system, including the burst pulse being sequentially connected
Optical sender, dynamic code reconstruct optical encoder, dynamic code reconstruct optical decoder, burst pulse photoreceiver, which reconstructs light
Coding/decoding system further includes control system, and the control system reconstructs optical encoder and the dynamic code with the dynamic code respectively
Optical decoder is reconstructed to be connected.
As shown in Fig. 2, the burst pulse optical sender includes burst pulse light source module, optical modulator, optical signal prosessing mould
Block and amplification driver, the burst pulse light source module are connected with the optical modulator, the amplification driver input terminal and institute
It states optical signal prosessing module to be connected, the amplification driver output end is connected with the optical modulator.
The optical signal transmitted on optical-fiber network is changed into electric signal by optical signal prosessing module, through amplification driver, into light
Modulator, modulation obtain the ultrashort laser for carrying user information by the ultrashort light pulse of burst pulse light source module input optical modulator
Pulse train.
Burst pulse light source module generates the chip light pulse of 1 bit time delay pulsewidth of N/mono-, and N is the code of selected code
It is long, up to PS magnitude.There are many types, including gain-switching semiconductor laser, ultrafast optical-fiber laser for burst pulse light source module
Device, super even spectrum laser etc..
The dynamic code reconstruct optical encoder carries out pumped FIR laser transformation to the burst pulse light sequence for carrying user information, is controlling
Under system manipulation processed, the code word of coding can change, and dynamic code reconstruct optical encoder can be realized under control of the control system
The dynamic restructuring of its code word；
The dynamic code reconstruct optical decoder carries out matching and decoding under control system manipulation, to pumped FIR laser transformation signal,
The burst pulse light sequence of carrying user information before recovering pumped FIR laser；
The decoded burst pulse light sequence for carrying user information of light is carried out photoelectric conversion by the burst pulse photoreceiver,
Become narrow pulse electrical signals, and this rz signal is become into non-return-to-zero signal, then carry out electro-optic conversion, restores former optical signal.
The set-up of control system security strategy provides the code word of corresponding change rule, and reconstructs light to the dynamic code
Encoder and dynamic code reconstruct optical decoder provide the control instruction for realizing this code word respectively.
The variation of the code word of the dynamic code reconstruct optical decoder and dynamic restructuring and the dynamic code reconstruct optical encoder
Be it is synchronous, the code word of dynamic code reconstruct optical decoder and dynamic code reconstruct optical encoder matches, and
It remains and matches during synchronous variation and dynamic restructuring.
The dynamic code reconstruct optical decoder includes the photodetector being sequentially connected, narrow pulse clock data recovery mould
Block and electronic signal processing module.
The set-up of control system security of system rank configures code word and its dynamic change program, and provide code word with
The computer program of relationship between the physical parameter of dynamic restructuring optical coder/decoder, as control instruction, control dynamic weight
The physical parameter of structure optical coder/decoder makes it show existing code word realistic as needed, and in real time in computer visualization
It shows and manipulates on interface.
The code word of dynamic code reconstruct optical encoder and dynamic code reconstruct optical decoder can change, in control system
Controlling lower light coder/decoder may be implemented the dynamic restructuring of its code word.Pumped FIR laser and photodissociation code are to carry out full light letter to optical signal
Breath processing realizes pumped FIR laser transformation and photodissociation code inverse transformation, only when the code word of photodissociation code and pumped FIR laser matches, in receiving end
Former optical signal can be just recovered, unauthorized user is impossible to get optical signal, enables optical signal safe transmission.To ensure
Safe transmission is remained in the worst cases or even in the case that listener-in obtains decoder, can be reconstructed using code word dynamic
State coding and decoding, prevents listener-in from detecting optical signal, so that system be made to have the safeguard function of anti-eavesdrop, ensures information
Safe transmission, greatly improve the safety of optical network system.
Different according to actual needs, there are many coding and decoding technologies of the alterable reconstruct of type；The encoding and decoding skill of use
Art includes one-dimensional time domain, the coding and decoding of frequency domain, the coding and decoding including two-dimentional time-frequency domain.There are many code words, and type includes
The m-sequence and Gold sequence of bipolar code, light orthogonal code, prime codes, algebra congruence codes of unipolar code etc..Dynamic restructuring light is compiled
There are many types, including super-structure optical fiber grating (SSFBG), optical fiber optical grating array for the structure of code device and dynamic restructuring optical decoder
(FBG), optical delay line (ODL), adjustable optical delay line (TODL), waveguide optical grating array (AWG), wavelength-selective switches (WSS) etc..
It is terminated receiving, the pumped FIR laser transformation signal come is transmitted on fiber channel, light is carried out by dynamic restructuring optical decoder
Decoded transform, into burst pulse photoreceiver.
As shown in figure 3, burst pulse photoreceiver is by photodetector, narrow pulse clock data recovery module, electric signal
Reason module composition, burst pulse photoreceiver are different from conventional photoreceiver, and what it received and handled is zero, chip-level arteries and veins
Wide narrow light pulse.By the photodissociation code signal exported after dynamic restructuring optical decoder matching and decoding, into burst pulse photoreceiver,
Photodissociation code signal is converted into narrow pulse electrical signals by photodetector, after carrying out clock and data recovery, electronic signal processing module
The electric signal that is zeroed is converted to the former optical signal output of non-return-to-zero.
If photodissociation transcoder and pumped FIR laser converter mismatch, optical signal cannot be obtained, presentation is noise, from
And prevent from being ravesdropping, protect the safe transmission of optical signal.
Control system configures code word and its dynamic change program according to security of system rank needs, and provide code word with
The computer program of relationship between the physical parameter of dynamic restructuring optical coder/decoder, as control instruction, control dynamic weight
The physical parameter of structure optical coder/decoder makes it show existing code word realistic as needed, and in real time in computer visualization
It is expressed on interface.The login page of system is as shown in Figure 4.
Dynamic code reconstruct light encoding and decoding are to drive encoding software using control system, generate required code word, conversion obtains
The physical parameter information of optical encoder hardware corresponding with code word, is controlled by control system, makes optical encoder institute
The code word of carrying generates change, to realize the reconstruct of code word.It is decoded can to control pumped FIR laser/light according to security policies
Variation constantly changes code word and optical encoder working condition, that is, forms the dynamic restructuring light encoding and decoding of code.Reliable hardware and software
Facility, the ability for making Transmission system have anti-eavesdrop, even if optical encoder is stolen, it is also not possible to steal the light letter of transmission
Breath.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (8)
1. a kind of dynamic code reconstructs light coding/decoding system, which is characterized in that including be sequentially connected burst pulse optical sender, dynamic
Code reconstruct optical encoder, dynamic code reconstruct optical decoder, burst pulse photoreceiver, and dynamic code reconstruct light coding/decoding system also wraps
Control system is included, optical encoder is reconstructed with the dynamic code respectively for the control system and the dynamic code reconstructs optical decoder phase
Even；
The burst pulse optical sender generates the burst pulse light sequence for carrying user information and generates 1 bit time delay N/mono-
The chip light pulse of pulsewidth, N are the code length of selected code；
The dynamic code reconstruct optical encoder carries out pumped FIR laser transformation to the burst pulse light sequence for carrying user information, is in control
Under system manipulation, the code word of coding can change, and dynamic code reconstruct optical encoder can be realized its code under control of the control system
The dynamic restructuring of word；
The dynamic code reconstruct optical decoder carries out matching and decoding under control system manipulation, to pumped FIR laser transformation signal, restores
The burst pulse light sequence of carrying user information before pumped FIR laser out；
The decoded burst pulse light sequence for carrying user information of light is carried out photoelectric conversion by the burst pulse photoreceiver, is become
Narrow pulse electrical signals, and this rz signal is become into non-return-to-zero signal, then carry out electro-optic conversion, restore former optical signal；
The burst pulse optical sender includes burst pulse light source module, optical modulator, optical signal prosessing module and amplification driver,
The burst pulse light source module is connected with the optical modulator, the amplification driver input terminal and the optical signal prosessing module
It is connected, the amplification driver output end is connected with the optical modulator；
The optical signal prosessing module, for the optical signal transmitted on optical-fiber network to be changed into electric signal, through amplification driver, into
Enter optical modulator, modulation is obtained by the ultrashort light pulse of burst pulse light source module input optical modulator and carried the narrow of user information
Pulsed light sequence；
The control system for configuring code word and its dynamic change program according to security of system rank needs, and provides code
Word and dynamic code reconstruct optical encoder, dynamic code reconstruct the computer program of the relationship between the physical parameter of optical decoder, make
For control instruction, the physical parameter of dynamic code reconstruct optical encoder, dynamic code reconstruct optical decoder is controlled, shows it on demand
It is required that the code word realized, and expressed on computer visualization interface in real time.
2. dynamic code according to claim 1 reconstructs light coding/decoding system, which is characterized in that the set-up of control system peace
Full strategy provides the code word of corresponding change rule, and reconstructs optical encoder and dynamic code reconstruct photodissociation to the dynamic code
Code device provides the control instruction for realizing this code word respectively.
3. dynamic code according to claim 2 reconstructs light coding/decoding system, which is characterized in that the burst pulse light source module
Using gain-switching semiconductor laser or ultrafast optical fiber laser or super even spectrum laser.
4. dynamic code according to claim 3 reconstructs light coding/decoding system, which is characterized in that the dynamic code reconstructs photodissociation
The variation of the code word of code device and dynamic restructuring are synchronous, the dynamic code reconstruct photodissociation with dynamic code reconstruct optical encoder
The code word of code device and dynamic code reconstruct optical encoder matches, and during synchronous variation and dynamic restructuring always
Holding matches.
5. dynamic code according to claim 4 reconstructs light coding/decoding system, which is characterized in that the dynamic code reconstruct light is compiled
Code device includes the coding and two-dimentional time-frequency domain coding of one-dimensional time domain, frequency domain, and the dynamic code reconstruct optical decoder includes one-dimensional
The decoding of time domain, frequency domain.
6. dynamic code according to claim 5 reconstructs light coding/decoding system, which is characterized in that the dynamic code reconstruct light is compiled
Code device and dynamic code reconstruct optical decoder code word include bipolar code m-sequence and Gold sequence, unipolar code light it is orthogonal
Code, prime codes, algebra congruence codes.
7. dynamic code according to claim 6 reconstructs light coding/decoding system, which is characterized in that the dynamic code reconstructs photodissociation
Code device includes the photodetector being sequentially connected, narrow pulse clock data recovery module and electronic signal processing module.
8. dynamic code according to claim 7 reconstructs light coding/decoding system, which is characterized in that the dynamic code reconstruct light is compiled
Code device and the dynamic code reconstruct dynamic structure of optical decoder include super-structure optical fiber grating, optical fiber optical grating array, light delay
Line, adjustable optical delay line, waveguide optical grating array, wavelength-selective switches.
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| CN106936508B (en) * | 2017-03-31 | 2019-08-16 | 深圳大学 | A kind of device for the security performance improving optical fiber communication transmission system |
| CN106998228A (en) * | 2017-03-31 | 2017-08-01 | 深圳大学 | A kind of optical transport network |
| CN108055104B (en) * | 2017-12-27 | 2019-06-21 | 广东腾通科技有限公司 | Code word generating means, communication base station, base station controller and cordless communication network |
| CN108494487B (en) * | 2018-03-30 | 2021-05-07 | 深圳大学 | Optical transmission system with enhanced safety |
| CN113660055B (en) * | 2021-08-06 | 2022-07-12 | 深圳大学 | One-dimensional optical coding method and code word design |
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| CN101867434A (en) * | 2010-05-27 | 2010-10-20 | 电子科技大学 | Method for enhancing confidentiality of optical code-division multiple access network information transmission |
| CN102932142A (en) * | 2012-10-08 | 2013-02-13 | 中国科学院西安光学精密机械研究所 | Optical data signal encryption and decryption method in optical fiber communication system |
| CN104468036A (en) * | 2014-11-21 | 2015-03-25 | 深圳大学 | Code reconstitution optical encoder/decoder based on WSS |
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| CN101867434A (en) * | 2010-05-27 | 2010-10-20 | 电子科技大学 | Method for enhancing confidentiality of optical code-division multiple access network information transmission |
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Inventor after: Wang Ke Inventor after: Ji Jianhua Inventor after: Zhang Zhipeng Inventor after: Yang Shuwen Inventor before: Wang Ke Inventor before: Ji Jianhua Inventor before: Zhang Zhipeng Inventor before: Pu Tao Inventor before: Fang Tao Inventor before: Liu Zhiqiang Inventor before: Li Zhaoyun Inventor before: Yang Shuwen |